I don't use a C Pap machine, so I can't say how well this works for that purpose. But I saw something similar sold for much more, as an anti-snoring device. I don't snore, but I do sleep with my mouth open, and it's been a problem. I use a dental mouth guard to prevent teeth grinding at night, and I'd wake and find it moved out of place due to my mouth having opened. I bought this in the hopes keeping my mouth closed would help. Also, I'd wake with a painfully dry mouth. I've used it since the day I got it 2 weeks ago, and can't believe the improvement in my sleep! I never realized how my open mouth somehow was disturbing my sleep. I have had most nights sleeping all the way through the night. No dry mouth, and no painful jaw from grinding or clenching. I thought it would be uncomfortable, but honestly, it's not. People talk about the straps being too long, but I just had to play around with the position and the tightness of the Velcro the first few nights. I'd like if it came in colors other than black.

Actually don;t use for CPAP. Use it because I open my mouth when I sleep and use it to prevent dry mouth. To keep the velcro on the straps from pulling loose, we sew them on at the exact length we need- also eliminates excess unneeded strap.Works great- got extras so can have one in the wash as required.

Best Answer:Actually the chin strap is for my husband, but anyway, he velcroes the back pieces together and then fits the front part on and velcroes it. It is easy now but when we first got it, we both tried to figure it out.

Overview
The snoring chin strap is the natural solution
to a quieter night’s sleep. Soft, comfortable chin strap for snoring is designed to stop snoring by gently cradling your jaw to keep your mouth closed. Also may help reduce dryness caused ...